so, this deck tries to eke out some card advantage over the course of the game until you have a boatload of hungry zombies.

Diregraf Ghoul gets some early beats in, or holds the ground for a turn or two. Cellar Door can really wreck a library early, and possibly you'll get a zombie out of it! Liliana functions to make them discard a card (and you discard Vengeful Pharoah for future creature destruction) or to get rid of one of their creatures... for Cemetery Reaper to eat and make a zombie token... which he will also buff. Dismember and Skinrender obv. take out other threats. Ghoulcaller's Chant and Ghoulraiser can get some of your dearly departed zombies back, and one beats face itself. finally you drop an Endless Ranks of the Dead to get to an insurmountable number of zombies in the late game.